[all-commits] [llvm/llvm-project] 14dcf8: [BOLT] Add --pad-funcs-before=func:n (#117924)

[Peter Waller via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 14dcf8214f9c66172d17c1cfaec6aec0030748e0
      https://github.com/llvm/llvm-project/commit/14dcf8214f9c66172d17c1cfaec6aec0030748e0
  Author: Peter Waller <peter.waller at arm.com>
  Date:   2024-12-11 (Wed, 11 Dec 2024)

  Changed paths:
    M bolt/lib/Core/BinaryEmitter.cpp
    M bolt/lib/Passes/ReorderFunctions.cpp
    A bolt/test/AArch64/pad-before-funcs.s

  Log Message:
  -----------
  [BOLT] Add --pad-funcs-before=func:n (#117924)

This complements --pad-funcs, and by using both simultaneously, enables
moving a specific function through the address space without modifying
any code
other than the targeted function (and references to it) by doing
(before+after=constant).

See also: proposed functionality to enable inserting random padding in

https://discourse.llvm.org/t/rfc-lld-feature-for-controlling-for-code-size-dependent-measurement-bias
and https://github.com/llvm/llvm-project/pull/117653



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